DE102014221678A1 - A method and apparatus for providing a tachograph service for vehicle diagnostics using an in-vehicle time synchronization message. - Google Patents

Abstract

A method of providing a tachograph service for vehicle diagnostics and an apparatus and system therefor are disclosed herein. A method for providing a tachograph service for vehicle diagnostics in an in-vehicle device connected to a network includes confirming whether a time synchronization message containing a tachograph address is received, updating status information in the device when the time synchronization message as a result Confirmation is received, and transmitting a status information message containing the updated status information to the tachograph address, which is set as a destination address. Therefore, a more stable tachograph service is provided for vehicle diagnosis.

Description

BACKGROUND

Technical area

The present disclosure relates to a tachograph for vehicle diagnosis, and more particularly, to a method of providing a tachograph service for vehicle diagnosis using an in-vehicle time synchronization message and means therefor.

Discussion of the related art

Vehicles that have recently been released are equipped with various electronic control devices to improve driver comfort and safety. Further, many such vehicles are equipped with an in-vehicle communication network for mutual communication between these electronic control devices.

In particular, Ethernet is widely used as an in-vehicle communication network. Ethernet generally includes a plurality of local area networks (LANs) and a plurality of bridges for bridging the LANs. Ethernet is characterized in that a plurality of nodes concurrently attempt to connect to a shared medium using a Carrier Sense Multiple Access / Collision Detection (CSMA / CD) protocol, for example, a carrier access multiple access and collision detection protocol to use the same. However, since all traffic is given the same priority and the plurality of nodes carry traffic through them by competition, such a CSMA / CD method is not suitable for transmitting multimedia data that is sensitive to transmission time delay, such as video or audio data. Therefore, Ethernet synchronizes times of all nodes in a network to transmit multimedia data that is sensitive to transmission time delay.

Recently developed IEEE 802.1 an audio / video bridge standard (AVB standard) , The AVB standard can be used to develop a transmission quality guarantee for effectively transmitting a multimedia stream with audio and video elements in a LAN. As described above, a simple Ethernet-capable LAN often uses a frame-based packet switching technique, and thus has a difficulty in ensuring an effective transmission quality.

To solve such a problem, researches IEEE 802.1 a method of implementing similar techniques using a bridge without affecting the paradigm of conventional asynchronous packet switching. Basically, IEEE 802.1 AVB technology enables synchronous traffic transmission using conventional Ethernet bridges that perform packet switching and synchronizes clocks of bridges within a particular geographic category. When clocks of the bridges are synchronized, Ethernet frames of a regular size between the bridges can be transmitted at a correct desired time through regular time intervals. Therefore, a bridge mesh using such a simple concept can be used as an infrastructure for stably transmitting synchronous traffic.

For example, a Precision Time Protocol (PTP) is after IEEE 1588 a time synchronization standard that can be applied in the entirety of Open System Interconnection Layers (OSI layers), and IEEE 802.1AS a time synchronization standard supporting only the profile of a second OSI layer 2, ie, a data link layer, based on IEEE 1588. When IEEE 802.1AS is applied to OSI layer 2 devices such as bridges, switches, etc., a time synchronization network of OSI layer 2 may be formed.

A method of synchronizing times between corresponding devices IEEE 802.1AS synchronizes times of a transmission page and a reception side using time stamps containing time synchronization information. A grandmaster (GM) providing a reference time for time synchronization is selected among devices in a network, and a local time of the selected grandmaster is transmitted to other devices by an advertisement message, so that these devices use the local time of the grandmaster as a reference time. Here, the grandmaster transmits the announcement message to all the other devices, and thus transmits a presence thereof and a comparison value thereof as a reference time for all the other devices. That is, the grandmaster is the top node of a timing tree after IEEE 802.1AS which periodically transmits current time information to lower nodes.

Further defined IEEE 802.1AS a procedure for determining a grandmaster and obtaining time synchronization, a method for searching all devices in a network, and controlling access to connections using a plurality of Control messages and a method for continuously acknowledging connection states by an advertisement message. However, IEEE 802.1AS does not disclose a method for obtaining diagnostic information of all devices in the network and effectively managing the devices.

SUMMARY

Accordingly, the present disclosure is directed to a method and apparatus for providing a tachograph service for vehicle diagnostics using an in-vehicle time synchronization message, while substantially avoiding one or more problems due to limitations and disadvantages of the related art.

An object of the present disclosure is to provide a method of providing a tachograph service for vehicle diagnostics using an in-vehicle time synchronization message. Another object of the present disclosure is to provide a method of providing a tachograph service for vehicle diagnostics that provides continuous and safe vehicle diagnostics as well as time synchronization by adding a message format for diagnosis to a Precision Time Protocol (PTP) method, which is described in US Pat IEEE 802.1AS is defined, can perform. Another object of the present disclosure is to provide a vehicle diagnostic tachograph recording method that can perform vehicle self-diagnosis and post-analysis by adding a format for diagnosis to an advertisement message between devices using the same time source. Yet another object of the present disclosure is to provide a method for collecting vehicle diagnostic information that diagnoses all devices in a vehicle and results of the diagnosis without defining a separate new method by adding vehicle diagnostic information to an announcement message that is used for conventional time synchronization , can record.

Additional advantages, objects, and features of the disclosure will be set forth in part by the following description, and may be learned by those of ordinary skill in the art upon examination of the following or learned by practice of the disclosure. The objects and other advantages of the disclosure may be realized and attained by the structure pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages, and in accordance with the purpose of the disclosure set forth and described herein, a method of providing a tachograph service for vehicle diagnostics in an in-vehicle device connected to a network includes: confirming whether a time synchronization message containing a tachograph address is received; Updating status information in the in-vehicle device when a time synchronization message is received as a result of the acknowledgment; and transmitting a status information message containing the updated status information to the tachograph address set as the destination address.

The time synchronization message can be generated by a grandmaster.

The time synchronization message may be received by a bridge connected to the grandmaster.

The tachograph address can be provided to the grandmaster through the bridge.

The time synchronization message may be formed by adding a tachograph address field to a page of an advertisement message format that is shown in FIG IEEE 802.1AS is defined.

The status information message may further include at least device identifier information to identify the in-vehicle device, type information to identify the type of in-vehicle device, and / or information about the latest update time indicating a time when the time synchronization message was last received.

The type of in-vehicle device may be a switch, an electronic control unit (ECU) or a grandmaster.

The method may further include transmitting a status information message indicating whether the in-vehicle device requires repair to the tachograph address set as the destination address if the time-synchronization message is not received for a certain time.

The status information may be set to a value corresponding to a normal state, a port error state, a response delay state, a power failure state, or a repair request state.

The port fault state, the response delay state, and the power fault state may be options selectable according to an option setting.

If there is another device connected to the in-vehicle device, the method may further include passing the time synchronization message to the in-vehicle device through a slave port of the other device.

The tachograph address may be an address of a media access control (MAC).

In another aspect of the present disclosure, a method of providing a tachograph service for vehicle diagnostics in a tachograph connected to an in-vehicle device through a network includes: transferring tachograph address information indicative of a tachograph address to a bridge; Receiving a status information message from the in-vehicle device through the bridge; and updating a diagnostic information table according to types of the in-vehicle device using the status information message, wherein the in-vehicle device generates the status information message when the in-vehicle device receives a time synchronization message generated by a grandmaster.

The types of in-vehicle equipment may include a switch, an electronic control unit (ECU), and a grandmaster.

The status information message may include at least device identifier information to identify the in-vehicle device, type information to identify the type of in-vehicle device, last update time information indicating a time when the time synchronization message was last received, status information representing the current state of the in-vehicle Specify means and / or include destination address information indicating a destination address that receives the status information message, the destination address is determined according to the address information of the tachograph.

The status information may be set to a value corresponding to a normal state, a port error state, a response delay state, a power failure state, or a repair request state.

The time synchronization message may be formed by adding a tachograph address field to a page of an advertisement message format that is shown in FIG IEEE 802.1AS is defined.

The method may further include receiving a status information table request message from a diagnostic device and transmitting the diagnostic information table to the diagnostic device.

In another aspect of the present disclosure, there is provided a computer-readable recording medium having a program recorded thereon to implement the method.

In another aspect of the present disclosure, a device connected to an in-vehicle network and using the same time information includes: a unit for confirming whether a time synchronization message including a tachograph address is received; a unit for updating status information in the in-vehicle device when the time synchronization message is received as a result of the confirmation; and a unit for transmitting a status information message containing the updated status information to a tachograph address set as a destination address.

In another aspect of the present disclosure, a tachograph connected to an in-vehicle device using the same time information through a network includes: a unit for transmitting tachograph address information indicating a tachograph address to a bridge; a unit for receiving a status information message from the in-vehicle device through the bridge; and a unit for updating a diagnostic information table according to types of the in-vehicle device using the status information message, wherein when the in-vehicle device receives a time synchronization message generated by a grandmaster, the device generates the status information message.

In yet another aspect of the present disclosure, a system for providing a tachograph service for vehicle diagnostics includes a grandmaster that generates a time synchronization message containing a tachograph address by certain durations and transmits the time synchronization message, an in-vehicle device that updates status information thereof when the vehicle Time synchronization message is received, and a status information message containing the updated status information transmits to the tachograph address set as the destination address, and a tachograph, which receives the status information message from the in-vehicle device and updates the diagnostic information table.

The system may further include a diagnostic device that transmits a status information table request message to the tachograph and receives the diagnostic information table.

It should be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate (are) an embodiment (s) of the disclosure and, together with the description, serve to explain the principle of the disclosure Epiphany. In the drawings:

1 a view that illustrates a conventional message header that is in IEEE 802.1AS is defined;

2 a view illustrating the structure of a conventional advertisement message, which in IEEE 802.1AS is defined;

3 a view showing a conventional announcement message comparison method and a port assignment method in IEEE 802.1AS illustrated;

4 a view showing a conventional time synchronization method in IEEE 802.1AS illustrated;

5 a flowchart illustrating a conventional grandmaster selection and announcement message transmission method;

6 a view illustrating the structure of a time synchronization message according to an embodiment of the present disclosure;

7 13 is a view illustrating the structure of a vehicle tachograph system for vehicle diagnosis according to an embodiment of the present disclosure;

8th a view illustrating the structure of a status information message according to an embodiment of the present disclosure;

9 a status information mapping table according to an embodiment of the present disclosure;

10 a tachograph diagnostic information table according to an embodiment of the present disclosure;

11 5 is a flowchart illustrating a tachograph recording and diagnostic method by a status information message according to an embodiment of the present disclosure; and

12 5 is a flowchart illustrating a method of providing a tachograph service for vehicle diagnostics using an in-vehicle time synchronization message according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail to the preferred embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. The suffixes "module" and "unit" in elements used in the following description are given or used together only in order to facilitate preparation of the description and have no particular meanings or functions.

Hereinafter, although an embodiment of the present disclosure illustrates all elements as combined, embodiments of the present disclosure are not limited thereto. That is, one or more elements of all elements may be selectively combined within the scope of the disclosure. Furthermore, all the elements may each be implemented by independent parts of the hardware or some elements of all the elements may be selectively combined and thus implemented by a computer program having a program module performing the functions of the combined elements in a plurality of pieces of hardware. Codes and code segments that make up the computer program can easily be derived by someone with technical skills. Such a computer program will be in a computer readable Storage medium stored and read by a computer and operated and is therefore able to implement embodiments of the present disclosure. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, etc.

Further, it will be understood that the term "containing," "forming," or "having" in the specification means that a corresponding element may be included or elements other than the element may be further included. It will be understood that all terms that include technical or scientific terms have the same meanings as those generally understood by someone with technical skill. The commonly used terms, such as the terms defined in a dictionary, can be interpreted to have meanings that match the meanings used in the art and thus can not be interpreted as having ideal or overly formal meanings.

Further, in describing elements of the present disclosure, the terms "first / first / first", "second / second / second", "A", "B", "(a)", "(b)", etc. may be used become. These terms are used only to distinguish one element from other elements, and the nature, order, or order of the corresponding element is not limited by these terms. If it is stated that one element is "connected", "combined" or "coupled" with another element, it will be understood that the former may be directly connected or combined with the latter, or other elements may be between the two elements.

In addition, it will be understood that the term "vehicle" or "other vehicle" or similar term used herein includes motor vehicles in general, such as passenger cars containing off-road vehicles (SUVs), buses, trucks, various business cars, watercraft containing a variety of boats and vessels, aircraft and the like, and hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen powered vehicles, and other alternative fuel vehicles (eg, fuels derived from non-petroleum fuels ). As referred to herein, a hybrid vehicle is a vehicle having two or more power sources, such as both gasoline powered and electrically powered vehicles.

Hereinafter, a conventional time synchronization method used in IEEE 802.1AS is short in terms of the 1 to 5 to be discribed.

IEEE 802.1AS defines header structures of messages used for network time synchronization, an announcement message structure, a method of selecting a grandmaster that provides reference time information, and a method of associating corresponding port functions in switches.

1 FIG. 14 is a view illustrating a conventional message header included in FIG IEEE 802.1AS is defined, and 2 FIG. 13 is a view illustrating the structure of a conventional advertisement message that is shown in FIG IEEE 802.1AS is defined. An advertisement message may include information required to select a grandmaster, such as currentUtcOffset, grandmasterPriority1, grandmasterPriority2, grandmasterClockQuality, grandmasterIdentity, etc. Hereinafter, for ease of description, the information required to select a grandmaster will be referred to as reference time information.

3 FIG. 13 is a view showing a conventional announcement message comparison method and a port assignment method in FIG IEEE 802.1AS illustrated. Each device of all qualified devices in a network can form an advertisement message containing reference time information of the same and then transmit the announcement message to other devices. Here you can select a device with the best quality clock as Grandmaster. When each device receives announcement messages from other devices, the device may compare reference time information included in the received announcement messages and its own reference time information, and select a device having the highest priority and accuracy as its own grandmaster. Of course, if the reference time of the corresponding device is more accurate than the reference times of other devices, the corresponding device may of course judge itself as Grandmaster.

All ports of a Grandmaster selected device are used to transmit reference time information to other devices. Hereinafter, for simplicity of description, ports used for transmitting reference time information of the grandmaster will be defined as master ports. On the other hand, ports of other devices connected to the master ports and used to receive the reference time information of the grandmaster will be defined as slave ports.

When each device receives an advertisement message, the corresponding device, as in FIG 3 shown receive time information of the received advertisement message, including grandmasterIdentity, grandmasterPriority1, clockclass, clockAccuracy, offsetScaledLogVariance, grandmasterPriority2, grandmasterIdentity, StepRemoved, and SourcePortIdentity, compare with their own reference time information and judge which device is selected as grandmaster. For example, when a device A judges that it is selected as a grandmaster, the device A allocates all ports thereof as master ports. On the other hand, if the device A judges that a device other than grandmaster is selected, the device A allocates all ports thereof as slave ports.

4 is a view that uses a conventional time synchronization method in IEEE 802.1AS illustrated. Is more detailed 4 a view illustrating a time synchronization method in a star topology network structure using a bridge.

In general, a bridge is a network connection device for connecting two local area networks (LANs) and is applied in a data link layer of an OSI reference model. The bridge can be used (1) when the area and the length of a communication network are increased, (2) when a larger number of facilities are connected to a communication network, (3) when bottlenecks occur due to an excessively large number of facilities having (4) when communication networks containing different physical media (eg, communication lines) need to be connected, and (5) when communication network structures are connected to different topologies such as Ethernet and token rings Need to become.

In relation to 4 it is assumed that a switch E 400 as grandmaster is selected by an initial time synchronization method. The switch E 400 may periodically generate an advertisement message containing its own reference time information and the advertisement message to a bridge 450 transfer. After that, the bridge can 450 the received announcement message to a switch A 410 , a switch B 420 , a switch C 430 and a switch D 440 transfer. In particular, the bridge can 450 Analyze time information contained in the received advertisement messages, detect a switch that provides the most accurate time information, and transmit only the advertisement message received from the detected switch to slave nodes.

5 Figure 13 is a flowchart illustrating a conventional grandmaster selection and announcement message transmission method. In relation to 5 transmit a switch 1 510 , a switch 2 520 , a switch 3 530 and a switch 4 540 Announcement messages to the switches connected to them, a grandmaster is by a reference time information comparison method of the respective switches 1 to 4 510 to 540 selected and functions of the ports of switches 1 to 4 510 to 540 are assigned according to results of the selection (operation S501). As exemplified in 5 shown, it is assumed that the switch 3 530 is selected as Grandmaster.

Thereafter, the switch generates 3 530 periodically an announcement message, for example, by a duration of 1 second, transmits the announcement message to the switch 2 520 and the switch 4 540 through master ports and the switch 2 520 transmits the received advertisement message to the switch 1 510 through its own slave ports (Operation S502). That is, an institution selected as Grandmaster may inform other entities of the presence of the Grandmaster and superiority of its own reference period.

6 FIG. 14 is a view illustrating the structure of a time synchronization message according to an embodiment of the present disclosure. FIG. Hereinafter, for simplicity of description, a time synchronization message and an advertisement message may be used together.

In relation to 6 may be a time synchronization message 600 by adding the field of a tachograph address (BoxAddr) 610 for diagnosis to the announcement message of 2 to be obtained. A device selected as Grandmaster may transmit an announcement message containing a tachograph address to all slave devices using the same time source, and the slave devices may update interior status information, specify a destination address as the tachograph address, and update the status information to a corresponding tachograph transfer. Here is the tachograph address 610 a MAC address assigned to a tachograph.

Although illustrated 6 the field of the tachograph address 610 as added to the end portion of a payload area of the conventional advertisement message, but this is only one embodiment and is not intended to limit the scope of the present disclosure. To In another embodiment of the present disclosure, the tachograph address 610 for example, using a reserved field included in the conventional advertisement message.

7 FIG. 14 is a view illustrating the structure of a vehicle tachograph system for vehicle diagnosis according to an embodiment of the present disclosure. FIG. In relation to 7 For example, the vehicle diagnostic tachograph system may have a star topology and a bridge 760 and a variety of switches 700 . 720 . 730 . 740 and 750 and one with the bridge 760 connected tachograph 710 contain.

The bridge 760 can MAC address information of the tachograph associated with it 710 and provide the MAC address information to a selected grandmaster. For example, the tachograph 710 its own MAC address to the bridge 760 transferred, with the tachograph 710 connected by a certain control method. If a grandmaster is selected, the bridge can 760 also the received MAC address of the tachograph 710 transferred to the Grandmaster. That is, the bridge 760 Each time a new Grandmaster is selected, the tachograph MAC address information can be changed 710 transferred to the newly selected Grandmaster. When the switch E 700 When grandmaster is selected by an initial time synchronization method, the switch transfers E 700 an advertisement message containing tachograph information periodically to the bridge 760 ,

After that, the bridge transmits 760 the received announcement message to all switches 720 to 750 that are connected to it. The switches 720 to 750 who have received the announcement message, set a destination as a tachograph address, and transmit certain status information messages containing diagnostic information to the bridge 760 , Then the bridge transfers 760 the received status information messages to the tachograph 710 , The tachograph 710 may generate a diagnostic information table using the received status information message and keep the diagnostic information table in a specific recording area.

True, in 7 no diagnostic device shown, but the tachograph 710 may read the diagnostic information table from the corresponding recording area in accordance with the request of the diagnostic device and then provide the diagnostic information table. Here is the tachograph 710 directly transmit the diagnostic information table to the diagnostic device through a wireless local communication link or wired connection. The wireless local communication may include BlueTooth communication, WiFi, etc.

According to another embodiment of the present disclosure, the diagnostic device may communicate with the bridge 760 be connected. In this case, the tachograph 710 a status information table request message from the diagnostic device through the bridge 760 receive and transmit a diagnostic information table to the diagnostic device.

Although illustrated 7 the star topology, but this is one embodiment of a network structure applicable to the present disclosure. According to another embodiment of the present disclosure, the vehicle diagnostic tachograph system may include various network structures, such as a ring topology, a meshed topology, a tree topology, etc.

8th FIG. 13 is a view illustrating the structure of a status information message according to an embodiment of the present disclosure. FIG. In relation to 8th can be a status information message 800 the field of a device identifier (Switch ID or ECU ID) 810 , the field of a type 820 , the field of a last update time (LastRecv) 830 , the field of status information (status) 840 and the field of a destination address (DestAddr) 850 contain.

The device identifier 810 consists of facility identification information assigned in advance to identify a switch or ECU in a network. The guy 820 consists of information to identify the type of a corresponding facility. Here, device types generally include a switch, an ECU, and a grandmaster. For example, a switch may be defined in advance as the value '0', an ECU defined in advance as the value '1', and a grandmaster defined in advance as the value '2'.

The last update time 830 means a date and time when a slave device last received an advertisement message from a grandmaster. The status information 840 may be diagnostic information sampled or judged by the slave device and including constants defined according to a normal state, a port error state, a response delay state, a power failure state, and a repair request state.

The destination address 850 means the tachograph MAC address. The tachograph MAC address can be obtained from the advertisement message received from the grandmaster.

9 FIG. 12 is a status information mapping table according to an embodiment of the present disclosure. FIG. In relation to 9 can be a status information mapping table 900 be a table at the status information 920 to specific values 910 be imaged.

The status information 920 may include a normal state, a port failure state, a response delay state, a power failure state, and a repair request state. Values that correspond to the states of the status information 920 may be defined as 0x10, 0x20, 0x30, 0x40 and 0x50. Here, the port error state, the response delay state and the power failure state may be defined as options and the corresponding option may be used in the status information message according to the option setting. On the other hand, the normal state and the repair request state should be taken into account when the status information message is generated.

For example, if the option setting is made such that options are not taken into account when a slave device does not receive an announcement message for a predetermined time, for example 15 seconds, the slave device may judge that a communication link is disconnected with a grandmaster, generate a status information message in which the value of the status information 920 is set to 0x50 (repair required state), and the status information message to the tachograph 710 transfer.

On the other hand, if the option setting is made such that options are considered when a slave device does not receive an announcement message for a predetermined time, for example, 2 seconds, the slave device may judge that a communication is delayed, generating a status information message, in the value of the status information 920 is set to 0 × 30 (the response delay state), and the status information message to the tachograph 710 transfer.

The configuration of the status information mapping table 900 , in the 9 is just one embodiment, and various types of status information may be added or modified according to the configuration of the device.

10 FIG. 10 is a tachograph diagnostic information table according to one embodiment of the present disclosure. FIG. A tachograph diagnostic information table 1000 contains the field of a type 1010 , the field of a facility identifier 1020 , the field of status information 1030 and the field of a last update time 1040 ,

In relation to 10 updated the tachograph 710 if the tachograph 710 receives a status information message, the tachograph diagnostic information table 1000 according to the status information message. Therefore, a vehicle operator or a vehicle mechanic may obtain a result of a real-time diagnosis such as a device malfunction, a communication link disconnection or a power error by confirming the tachograph diagnostic information table 1000 intuitively confirm. Therefore, a user can confirm a cause of a vehicle malfunction more quickly.

In particular, the user may confirm which device is selected as a current grandmaster and intuitively confirm a change in the grandmaster. Of course, the tachograph diagnostic information table can 1000 be recorded in a non-volatile memory. The reason for this is that after occurrence of a vehicle accident, the tachograph diagnostic information table 1000 can be effectively used to confirm a cause of the accident and to prepare for action.

Since a problem such as a sudden acceleration / deceleration of a vehicle or starting of a vehicle while driving is not reproducible, it may be difficult to examine a cause of the problem and take measures against the problem. However, the user can view the tachograph diagnostic information table 1000 confirm after an accident and thus detect a correct cause of the accident.

11 FIG. 10 is a flowchart illustrating a tachograph recording and diagnostic method by a status information message according to an embodiment of the present disclosure. FIG. In relation to 11 For example, a tachograph system for vehicle diagnosis according to this embodiment may include a switch C 1130 , who is selected as grandmaster, a tachograph 1140 and a switch B 1120 that with the switch c 1130 directly connected, a switch A 1115 which is connected to the switch B1120 and an internal / external diagnostic device 1150 contain.

As exemplified in 11 shown, the switch C transmits 1130 when the switch C 1130 when Grandmaster is selected, an announcement message to Switch B 1120 and then transmits a status information message to the tachograph 1140 (Operation S1101 and Operation S1102).

The switch B 1120 transmits the received advertisement message to the switch A. 1115 , updates its own status and transmits a status information message containing the updated status information to the tachograph 1140 (Operation S1103 and Operation S1104).

When the switch A 1115 the advertisement message is received, the switch A updates 1115 its own status and transmits a status information message containing the updated status information to the tachograph 1140 (Operation S1105).

Thereafter, the switch C transmits 1130 periodically an announcement message to the switch B 1120 and the switch B 1120 and the switch A 1115 update their respective status according to the received advertisement message and transmit the updated status information to the tachograph 1140 by status information messages (operation S1106 to operation S1109). Here could the switch C 1130 which is selected as Grandmaster, its own status information not to the tachograph 1140 transfer.

The tachograph 1140 updates the tachograph diagnostic information table 1000 using the received status information messages. The internal / external diagnostic device 1150 can the tachograph 1140 request to transmit the status information table through a predetermined communication connection (operation S1110). The tachograph 1140 transmits the status information table to the internal / external diagnostic device 1150 in accordance with the status information table request (operation S1111).

12 FIG. 10 is a flow chart illustrating a method for providing a tachograph service for vehicle diagnostics using an in-vehicle time synchronization message according to an embodiment of the present disclosure.

In relation to 12 A first device that is not selected as a grandmaster and is in the same network as the grandmaster initializes a particular timer and drives the timer (operation S1203). Here, the timer is driven for an announcement message transmission period. If the first device does not receive an announcement message from the grandmaster until the timer has timed out, the first device notifies the tachograph of the non-receipt of the announcement message.

When the first device receives the announcement message from the grandmaster prior to the timing of driving the timer, the first device resets the timer during the drive and updates the status information in the first device (operation S1205 to operation S1207).

If there is a second device connected to a slave port of the first device, the first device transmits the advertisement message received in the operation S1203 to the second device through the slave port (operation S1209).

After updating the status information of the first device has been completed, the first device thereafter transmits a status information message containing the updated status information to the tachograph 710 in relation to the tachograph address 610 included in the advertisement message received in operation S1203.

The tachograph 710 identifies the type 820 which is included in the received status information message and updates the tachograph diagnostic information table 1000 according to the identified type 820 (Operation S1215 through Operation S1225). For example, the tachograph updates 710 Switch status information if the value of the type 820 the received status information message is '0', ECU status information if the value of the type 820 '1', and grandmaster status information if the value of the type 820 '2' is.

In operation S1205, when the first device does not receive the announcement message from the grandmaster until the timer is timed out, the first device transmits a status information message indicating a repair request to the tachograph 710 , Then the tachograph leads 710 perform the operation S1215 through operation S1225.

As apparent from the above description, a method and apparatus according to the present disclosure will have effects as follows.

First, the present disclosure provides a tachograph service for vehicle diagnostics using an in-vehicle time synchronization message.

Secondly, the present disclosure provides a method of recording a vehicle diagnostic tachograph that can perform continuous and safe vehicle self-diagnosis and time synchronization by adding a method of diagnosis to a protocol method that is described in U.S. Pat IEEE 802.1AS is defined.

Third, the present disclosure provides a vehicle diagnostic tachograph recording method that can perform vehicle self-diagnosis and post-analysis by adding a format for diagnosis to an advertisement message between devices using the same time source.

Fourth, the present disclosure provides a vehicle diagnostic tachograph that can diagnose all devices in a vehicle and record results of diagnosis without defining a separate method by adding vehicle diagnostic information to an advertisement message conventionally used for time synchronization.

Fifth, the present disclosure records diagnostic information received from respective devices according to time synchronization periods in a tachograph, and thus can examine a cause of an accident and prevent the accident.

Sixth, the present disclosure separately manages the status of Grandmaster and thus can IEEE 802.1AS in terms of safety.

It will be apparent to one of ordinary skill in the art that various modifications and variations can be made to the present disclosure without departing from the spirit or scope of the disclosure. Accordingly, it is intended that the present disclosure cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and equivalents thereof.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• IEEE 802.1 an audio / video bridge standard (AVB standard) [0004]
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• IEEE 802.1AS [0016]
• IEEE 802.1AS [0028]
• IEEE 802.1AS [0037]
• IEEE 802.1AS [0038]
• IEEE 802.1AS [0039]
• IEEE 802.1AS [0040]
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• IEEE 802.1AS [0106]

Claims (24)

A method of providing a tachograph service for vehicle diagnostics in an in-vehicle device connected to a network, comprising: Confirming whether a time synchronization message containing a tachograph address is received; Updating status information in the in-vehicle device when the time synchronization message is received as a result of the acknowledgment; and Transmitting a status information message containing the updated status information to the tachograph address set as the destination address. The method of claim 1, wherein the time synchronization message is generated by a grandmaster. The method of claim 2, wherein the time synchronization message is received by a bridge connected to the grandmaster. The method of claim 3, wherein the tachograph address is provided to the grandmaster by the bridge. The method of claim 1, wherein the time synchronization message is formed by adding a tachograph address field to a page of an advertisement message format defined in IEEE 802.1AS. The method of claim 1, wherein the status information message further includes at least device identifier information to identify the in-vehicle device, type information to identify the type of in-vehicle device, and / or information about the latest update time that indicates a time when the time synchronization message last received has been. The method of claim 6, wherein the type of in-vehicle device is a switch, an electronic control unit (ECU) or a grandmaster. The method of claim 1, further comprising: Transmitting a status information message indicating whether the in-vehicle device requires repair to the tachograph address set as the destination address if the time-synchronization message is not received for a certain time. The method of claim 1, wherein the status information is set to a value corresponding to a normal state, a port error state, a response delay state, a power failure state, or a repair request state. The method of claim 9, wherein the port error state, the response delay state and the power error state are options selectable according to an option setting. The method of claim 1, further comprising, when there is another device connected to the in-vehicle device, transmitting the time-synchronization message to the in-vehicle device through a slave port of the other device. The method of claim 1, wherein the tachograph address is a media access control (MAC) address. A method of providing a tachograph service for vehicle diagnostics in a tachograph connected to an in-vehicle device through a network, comprising: Transmitting tachograph address information indicating a tachograph address to a bridge; Receiving a status information message from the in-vehicle device through the bridge; and Updating a diagnostic information table according to the types of the in-vehicle device using the status information message; wherein when the in-vehicle device receives a time synchronization message generated by a grandmaster, the in-vehicle device generates the status information message. The method of claim 13, wherein the types of in-vehicle device include a switch, an electronic control unit (ECU), and a grandmaster. The method of claim 13, wherein the status information message includes at least device identifier information to identify the in-vehicle device, type information to identify the type of in-vehicle device, information about a latest update time that indicates a time when the time synchronization message was last received, status information that indicate the current status of the in-vehicle device, and / or include destination address information indicating a destination address that receives the status information message, the destination address being determined in accordance with the tachograph address information. The method of claim 15, wherein the status information is set to a value that corresponds to a normal state, a port fault state, a response delay state, a power failure state, or a repair request state. The method of claim 13, wherein the time synchronization message is formed by adding a tachograph address field to a page of an advertisement message format defined in IEEE 802.1AS. The method of claim 13, further comprising: Receiving a status information table request message from a diagnostic device; and Transmitting the diagnostic information table to the diagnostic device. A computer readable recording medium having a program recorded thereon for implementing the method of claim 1. A computer readable recording medium having a program recorded thereon for implementing the method of claim 13. Device connected to an in-vehicle network and using the same time information, comprising: a unit for confirming whether a time synchronization message containing a tachograph address is received; a unit for updating status information in the in-vehicle device when the time synchronization message is received as a result of the confirmation; and a unit for transmitting a status information message containing the updated status information to the tachograph address set as a destination address. A tachograph connected to an in-vehicle device using the same time information through a network, comprising: a unit for transmitting tachograph address information including a tachograph address to a bridge; a unit for receiving a status information message from the in-vehicle device through the bridge; and a unit for updating a diagnosis information table according to types of the in-vehicle device using the status information message, wherein, when the in-vehicle device receives a time synchronization message generated by a grandmaster, the device generates the status information message. A system for providing a tachograph service for vehicle diagnosis, comprising: a grandmaster that generates a time synchronization message containing a tachograph address by certain durations and transmits the time synchronization message; an in-vehicle device that updates status information thereof when the time synchronization message is received and transmits a status information message including the updated status information to the tachograph address set as the destination address; and a tachograph that receives the status information message from the in-vehicle device and updates a diagnostic information table. The system of claim 23, further comprising a diagnostic device that transmits a status information table request message to the tachograph and receives the diagnostic information table.

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